You don't seem to understand. Much of history was reported orally, and never written down.Uh, they didn't tell either.
However, you are still wrong, because (as I said before) "With Jesus, we have letters attesting to his existence by someone who knew his followers, we have four "lives" (ancient biographies) between 30-70 years of his mission, a number of other epistles, an altered reference by Josephus, an unaltered passing reference by Josephus, a possible reference by Thallus, etc.
That is more than all but a handful of ancient figures, most of whom were emperors or members of highly elite and literate communities, not preachers from the backwaters of galilee"